arm64: GICv3 support

Hi Marc,

Add:

Reviewed-by Yun Wu <[email protected]>

Acked-by Zhen Lei <[email protected]>

for the first 4 patches, that is:

Quoted 4 lines

ARM: GIC: move some bits of GICv2 to a library-type file
arm64: initial support for GICv3
arm64: GICv3 device tree binding documentation
arm64: boot protocol documentation update for GICv3

Cheers,
Abel.

Quoted 137 lines · Marc Zyngier

GICv3 is the base for a new generation of interrupt controllers designed to overcome some of the most glaring limitations of GICv2.

Some of the features are:
- Support for more than 8 CPUs (a lot more...)
- System registers for CPU interface access (instead of the memory mapped GICC, GICV, GICH)
- Message based interrupts

This patch series currently support:
- Affinity Routing
- System Registers
- Non-Secure Group-1 interrupts only
- KVM support (GICv3 host, GICv2 guest)

What is *not yet* supported in this series (WIP):
- LPI/ITS/MSI
- KVM GICv3 guest support
- Any form of power management
- 32bit systems

To be built, this code requires a fairly recent compiler/binutils combo. Linaro 13.06 seems to do the trick. This has been tested on the ARM FVP and Foundation models, with non-regressions run on a VExpress TC-2 and another Cortex-A57 based platform.

So far, the level of reviewing has been embarassingly low (my sincere thanks to Christoffer and Will for being the only ones to review it). While the documentation is unfortunately not public yet, it is available to those actively implementing GICv3 in their hardware, and I'm really eager to see reviews and test reports.

Without that kind of engagement, it is unlikely that this code will get merged any time soon.

Individuals without access to documentation and/or hardware can still review the code (it shares a lot of concepts with GICv2) and test in on the freely available Foundation model (see
http://releases.linaro.org/latest/openembedded/aarch64/ for details on how to use the Foundation model).

The code is also available at the following location (warning, unstable branch!):
git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/gicv3

* From v3 [3]
- Fixed a lot of issues found by Christoffer (too many to report here, see the email thread)
- New .sync_lr_elrsr backend
- New probing method
- New irqchip_in_kernel implementation
- Checked full bisectability of the series (hopefully got it right

    this time...)

- rebased on top of 3.15-rc5

* From v2 [2]
- removed sharing of the xlate method with GICv2 (TI crossbar is now getting in the way...)
- Switched to a tree domain to accomodate for the LPI space
- Fixed more bisectability

* From the initial revision [1]
- Some code sharing with GICv2
- Barrier cleanup/clarification
- Revised boot protocol update
- Consistent use of the MPIDR access macros
- Fixed a number of embarassing bugs
- Fixed DT examples
- Fixed bisectability of the series

[1]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-February/229959.html
[2]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-March/241972.html
[3]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-April/248008.html

Marc Zyngier (20):
ARM: GIC: move some bits of GICv2 to a library-type file
arm64: initial support for GICv3
arm64: GICv3 device tree binding documentation
arm64: boot protocol documentation update for GICv3
KVM: arm/arm64: vgic: move GICv2 registers to their own structure
KVM: ARM: vgic: introduce vgic_ops and LR manipulation primitives
KVM: ARM: vgic: abstract access to the ELRSR bitmap
KVM: ARM: vgic: abstract EISR bitmap access
KVM: ARM: vgic: abstract MISR decoding
KVM: ARM: vgic: move underflow handling to vgic_ops
KVM: ARM: vgic: abstract VMCR access
KVM: ARM: vgic: introduce vgic_enable
KVM: ARM: introduce vgic_params structure
KVM: ARM: vgic: split GICv2 backend from the main vgic code
KVM: ARM: vgic: revisit implementation of irqchip_in_kernel
arm64: KVM: remove __kvm_hyp_code_{start,end} from hyp.S
arm64: KVM: split GICv2 world switch from hyp code
arm64: KVM: move HCR_EL2.{IMO,FMO} manipulation into the vgic switch
code
KVM: ARM: vgic: add the GICv3 backend
arm64: KVM: vgic: add GICv3 world switch

 Documentation/arm64/booting.txt                  |   6 +
 Documentation/devicetree/bindings/arm/gic-v3.txt |  79 +++
 arch/arm/include/asm/kvm_host.h                  |   5 +
 arch/arm/kernel/asm-offsets.c                    |  14 +-
 arch/arm/kvm/Makefile                            |   1 +
 arch/arm/kvm/interrupts_head.S                   |  26 +-
 arch/arm64/Kconfig                               |   1 +
 arch/arm64/include/asm/kvm_arm.h                 |   5 +-
 arch/arm64/include/asm/kvm_asm.h                 |  14 +-
 arch/arm64/include/asm/kvm_host.h                |  28 +
 arch/arm64/include/asm/virt.h                    |   4 +
 arch/arm64/kernel/asm-offsets.c                  |  25 +-
 arch/arm64/kernel/head.S                         |  18 +
 arch/arm64/kernel/hyp-stub.S                     |   1 +
 arch/arm64/kvm/Makefile                          |   4 +
 arch/arm64/kvm/hyp.S                             | 127 +----
 arch/arm64/kvm/vgic-v2-switch.S                  | 133 +++++
 arch/arm64/kvm/vgic-v3-switch.S                  | 271 +++++++++
 drivers/irqchip/Kconfig                          |   5 +
 drivers/irqchip/Makefile                         |   3 +-
 drivers/irqchip/irq-gic-common.c                 | 115 ++++
 drivers/irqchip/irq-gic-common.h                 |  29 +
 drivers/irqchip/irq-gic-v3.c                     | 684 +++++++++++++++++++++++
 drivers/irqchip/irq-gic.c                        |  59 +-
 include/kvm/arm_vgic.h                           | 115 +++-
 include/linux/irqchip/arm-gic-v3.h               | 190 +++++++
 virt/kvm/arm/vgic-v2.c                           | 236 ++++++++
 virt/kvm/arm/vgic-v3.c                           | 225 ++++++++
 virt/kvm/arm/vgic.c                              | 345 ++++++------
 29 files changed, 2415 insertions(+), 353 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/gic-v3.txt
 create mode 100644 arch/arm64/kvm/vgic-v2-switch.S
 create mode 100644 arch/arm64/kvm/vgic-v3-switch.S
 create mode 100644 drivers/irqchip/irq-gic-common.c
 create mode 100644 drivers/irqchip/irq-gic-common.h
 create mode 100644 drivers/irqchip/irq-gic-v3.c
 create mode 100644 include/linux/irqchip/arm-gic-v3.h
 create mode 100644 virt/kvm/arm/vgic-v2.c
 create mode 100644 virt/kvm/arm/vgic-v3.c